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linux/fs/smb/client/cifsproto.h
Paulo Alcantara 40e75e42f4 smb: client: fix open handle lookup in cifs_open() 
When looking up open handles to be re-used in cifs_open(), calling
cifs_get_{writable,readable}_path() is wrong as it will look up for
the first matching open handle, and if @file->f_flags doesn't match,
it will ignore the remaining open handles in
cifsInodeInfo::openFileList that might potentially match
@file->f_flags.

For writable and readable handles, fix this by calling
__cifs_get_writable_file() and __find_readable_file(), respectively,
with FIND_OPEN_FLAGS set.

With the patch, the following program ends up with two opens instead
of three sent over the wire.

```
  #define _GNU_SOURCE
  #include <unistd.h>
  #include <string.h>
  #include <fcntl.h>

  int main(int argc, char *argv[])
  {
          int fd;

          fd = open("/mnt/1/foo", O_CREAT | O_WRONLY | O_TRUNC, 0664);
          close(fd);
          fd = open("/mnt/1/foo", O_DIRECT | O_WRONLY);
          close(fd);
          fd = open("/mnt/1/foo", O_WRONLY);
          close(fd);
          fd = open("/mnt/1/foo", O_DIRECT | O_WRONLY);
          close(fd);
          return 0;
  }
```

```
$ mount.cifs //srv/share /mnt/1 -o ...
$ gcc test.c && ./a.out
```

Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.org>
Reviewed-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Cc: David Howells <dhowells@redhat.com>
Cc: linux-cifs@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
2026-03-11 18:46:40 -05:00

618 lines
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/* SPDX-License-Identifier: LGPL-2.1 */
/*
*
* Copyright (c) International Business Machines Corp., 2002,2008
* Author(s): Steve French (sfrench@us.ibm.com)
*
*/
#ifndef _CIFSPROTO_H
#define _CIFSPROTO_H
#include <linux/nls.h>
#include <linux/ctype.h>
#include "cifsglob.h"
#include "trace.h"
#ifdef CONFIG_CIFS_DFS_UPCALL
#include "dfs_cache.h"
#endif
#include "smb1proto.h"
struct statfs;
struct smb_rqst;
struct smb3_fs_context;
/*
*****************************************************************
* All Prototypes
*****************************************************************
*/
void *cifs_buf_get(void);
void cifs_buf_release(void *buf_to_free);
void *cifs_small_buf_get(void);
void cifs_small_buf_release(void *buf_to_free);
void free_rsp_buf(int resp_buftype, void *rsp);
int smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg,
size_t *sent);
unsigned int _get_xid(void);
void _free_xid(unsigned int xid);
#define get_xid() \
({ \
unsigned int __xid = _get_xid(); \
cifs_dbg(FYI, "VFS: in %s as Xid: %u with uid: %d\n", \
__func__, __xid, \
from_kuid(&init_user_ns, current_fsuid())); \
trace_smb3_enter(__xid, __func__); \
__xid; \
})
#define free_xid(curr_xid) \
do { \
_free_xid(curr_xid); \
cifs_dbg(FYI, "VFS: leaving %s (xid = %u) rc = %d\n", \
__func__, curr_xid, (int)rc); \
if (rc) \
trace_smb3_exit_err(curr_xid, __func__, (int)rc); \
else \
trace_smb3_exit_done(curr_xid, __func__); \
} while (0)
int init_cifs_idmap(void);
void exit_cifs_idmap(void);
int init_cifs_spnego(void);
void exit_cifs_spnego(void);
const char *build_path_from_dentry(struct dentry *direntry, void *page);
char *__build_path_from_dentry_optional_prefix(struct dentry *direntry,
void *page, const char *tree,
int tree_len, bool prefix);
char *build_path_from_dentry_optional_prefix(struct dentry *direntry,
void *page, bool prefix);
static inline void *alloc_dentry_path(void)
{
return __getname();
}
static inline void free_dentry_path(void *page)
{
if (page)
__putname(page);
}
char *cifs_build_path_to_root(struct smb3_fs_context *ctx,
struct cifs_sb_info *cifs_sb,
struct cifs_tcon *tcon, int add_treename);
char *cifs_build_devname(char *nodename, const char *prepath);
void delete_mid(struct TCP_Server_Info *server, struct mid_q_entry *mid);
void __release_mid(struct TCP_Server_Info *server,
struct mid_q_entry *midEntry);
void cifs_wake_up_task(struct TCP_Server_Info *server,
struct mid_q_entry *mid);
int cifs_handle_standard(struct TCP_Server_Info *server,
struct mid_q_entry *mid);
char *smb3_fs_context_fullpath(const struct smb3_fs_context *ctx, char dirsep);
int smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx);
int smb3_parse_opt(const char *options, const char *key, char **val);
int cifs_ipaddr_cmp(struct sockaddr *srcaddr, struct sockaddr *rhs);
bool cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs);
int cifs_discard_remaining_data(struct TCP_Server_Info *server);
int cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
mid_receive_t receive, mid_callback_t callback,
mid_handle_t handle, void *cbdata, const int flags,
const struct cifs_credits *exist_credits);
struct TCP_Server_Info *cifs_pick_channel(struct cifs_ses *ses);
int cifs_send_recv(const unsigned int xid, struct cifs_ses *ses,
struct TCP_Server_Info *server, struct smb_rqst *rqst,
int *resp_buf_type, const int flags, struct kvec *resp_iov);
int compound_send_recv(const unsigned int xid, struct cifs_ses *ses,
struct TCP_Server_Info *server, const int flags,
const int num_rqst, struct smb_rqst *rqst,
int *resp_buf_type, struct kvec *resp_iov);
int cifs_sync_mid_result(struct mid_q_entry *mid,
struct TCP_Server_Info *server);
int __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
struct smb_rqst *rqst);
int wait_for_free_request(struct TCP_Server_Info *server, const int flags,
unsigned int *instance);
int cifs_wait_mtu_credits(struct TCP_Server_Info *server, size_t size,
size_t *num, struct cifs_credits *credits);
static inline int
send_cancel(struct cifs_ses *ses, struct TCP_Server_Info *server,
struct smb_rqst *rqst, struct mid_q_entry *mid,
unsigned int xid)
{
return server->ops->send_cancel ?
server->ops->send_cancel(ses, server, rqst, mid, xid) : 0;
}
int wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *mid);
void smb2_query_server_interfaces(struct work_struct *work);
void cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
bool all_channels);
void cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
bool mark_smb_session);
int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session);
bool backup_cred(struct cifs_sb_info *cifs_sb);
bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file,
bool from_readdir);
void cifs_write_subrequest_terminated(struct cifs_io_subrequest *wdata,
ssize_t result);
struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
int flags);
int __cifs_get_writable_file(struct cifsInodeInfo *cifs_inode,
unsigned int find_flags, unsigned int open_flags,
struct cifsFileInfo **ret_file);
int cifs_get_writable_path(struct cifs_tcon *tcon, const char *name, int flags,
struct cifsFileInfo **ret_file);
struct cifsFileInfo *__find_readable_file(struct cifsInodeInfo *cifs_inode,
unsigned int find_flags,
unsigned int open_flags);
int cifs_get_readable_path(struct cifs_tcon *tcon, const char *name,
struct cifsFileInfo **ret_file);
int cifs_get_hardlink_path(struct cifs_tcon *tcon, struct inode *inode,
struct file *file);
int decode_negTokenInit(unsigned char *security_blob, int length,
struct TCP_Server_Info *server);
int cifs_convert_address(struct sockaddr *dst, const char *src, int len);
void cifs_set_port(struct sockaddr *addr, const unsigned short int port);
struct timespec64 cifs_NTtimeToUnix(__le64 ntutc);
u64 cifs_UnixTimeToNT(struct timespec64 t);
struct timespec64 cnvrtDosUnixTm(__le16 le_date, __le16 le_time, int offset);
void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock);
int cifs_get_writer(struct cifsInodeInfo *cinode);
void cifs_put_writer(struct cifsInodeInfo *cinode);
void cifs_done_oplock_break(struct cifsInodeInfo *cinode);
int cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
unsigned int xid);
int cifs_push_mandatory_locks(struct cifsFileInfo *cfile);
void cifs_down_write(struct rw_semaphore *sem);
struct cifsFileInfo *cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
struct tcon_link *tlink, __u32 oplock,
const char *symlink_target);
int cifs_posix_open(const char *full_path, struct inode **pinode,
struct super_block *sb, int mode, unsigned int f_flags,
__u32 *poplock, __u16 *pnetfid, unsigned int xid);
void cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr);
void cifs_unix_basic_to_fattr(struct cifs_fattr *fattr,
FILE_UNIX_BASIC_INFO *info,
struct cifs_sb_info *cifs_sb);
void cifs_dir_info_to_fattr(struct cifs_fattr *fattr,
FILE_DIRECTORY_INFO *info,
struct cifs_sb_info *cifs_sb);
int cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr,
bool from_readdir);
struct inode *cifs_iget(struct super_block *sb, struct cifs_fattr *fattr);
int cifs_get_inode_info(struct inode **inode, const char *full_path,
struct cifs_open_info_data *data,
struct super_block *sb, int xid,
const struct cifs_fid *fid);
int smb311_posix_get_inode_info(struct inode **inode, const char *full_path,
struct cifs_open_info_data *data,
struct super_block *sb,
const unsigned int xid);
int cifs_get_inode_info_unix(struct inode **pinode,
const unsigned char *full_path,
struct super_block *sb, unsigned int xid);
int cifs_set_file_info(struct inode *inode, struct iattr *attrs,
unsigned int xid, const char *full_path, __u32 dosattr);
int cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
const unsigned int xid);
int sid_to_id(struct cifs_sb_info *cifs_sb, struct smb_sid *psid,
struct cifs_fattr *fattr, uint sidtype);
int cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
struct inode *inode, bool mode_from_special_sid,
const char *path, const struct cifs_fid *pfid);
int id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 *pnmode,
kuid_t uid, kgid_t gid);
struct smb_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
struct inode *inode, const char *path,
u32 *pacllen, u32 info);
struct smb_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb,
const struct cifs_fid *cifsfid,
u32 *pacllen, u32 info);
struct posix_acl *cifs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
int type);
int cifs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
struct posix_acl *acl, int type);
int set_cifs_acl(struct smb_ntsd *pnntsd, __u32 acllen, struct inode *inode,
const char *path, int aclflag);
unsigned int setup_authusers_ACE(struct smb_ace *pntace);
unsigned int setup_special_mode_ACE(struct smb_ace *pntace, bool posix,
__u64 nmode);
unsigned int setup_special_user_owner_ACE(struct smb_ace *pntace);
void dequeue_mid(struct TCP_Server_Info *server, struct mid_q_entry *mid,
bool malformed);
int cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
unsigned int to_read);
ssize_t cifs_discard_from_socket(struct TCP_Server_Info *server,
size_t to_read);
int cifs_read_iter_from_socket(struct TCP_Server_Info *server,
struct iov_iter *iter, unsigned int to_read);
int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb);
void cifs_mount_put_conns(struct cifs_mount_ctx *mnt_ctx);
int cifs_mount_get_session(struct cifs_mount_ctx *mnt_ctx);
int cifs_is_path_remote(struct cifs_mount_ctx *mnt_ctx);
int cifs_mount_get_tcon(struct cifs_mount_ctx *mnt_ctx);
int cifs_match_super(struct super_block *sb, void *data);
int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx);
void cifs_umount(struct cifs_sb_info *cifs_sb);
void cifs_mark_open_files_invalid(struct cifs_tcon *tcon);
void cifs_reopen_persistent_handles(struct cifs_tcon *tcon);
bool cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset,
__u64 length, __u8 type, __u16 flags,
struct cifsLockInfo **conf_lock, int rw_check);
void cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink,
struct cifs_pending_open *open);
void cifs_add_pending_open_locked(struct cifs_fid *fid,
struct tcon_link *tlink,
struct cifs_pending_open *open);
void cifs_del_pending_open(struct cifs_pending_open *open);
bool cifs_is_deferred_close(struct cifsFileInfo *cfile,
struct cifs_deferred_close **pdclose);
void cifs_add_deferred_close(struct cifsFileInfo *cfile,
struct cifs_deferred_close *dclose);
void cifs_del_deferred_close(struct cifsFileInfo *cfile);
void cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode);
void cifs_close_all_deferred_files(struct cifs_tcon *tcon);
void cifs_close_all_deferred_files_sb(struct cifs_sb_info *cifs_sb);
void cifs_close_deferred_file_under_dentry(struct cifs_tcon *tcon,
struct dentry *dentry);
void cifs_mark_open_handles_for_deleted_file(struct inode *inode,
const char *path);
struct TCP_Server_Info *cifs_get_tcp_session(struct smb3_fs_context *ctx,
struct TCP_Server_Info *primary_server);
void cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect);
void cifs_put_tcon(struct cifs_tcon *tcon, enum smb3_tcon_ref_trace trace);
void cifs_release_automount_timer(void);
void cifs_proc_init(void);
void cifs_proc_clean(void);
void cifs_move_llist(struct list_head *source, struct list_head *dest);
void cifs_free_llist(struct list_head *llist);
void cifs_del_lock_waiters(struct cifsLockInfo *lock);
int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon);
int cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
struct TCP_Server_Info *server);
int cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
struct TCP_Server_Info *server,
struct nls_table *nls_info);
int cifs_enable_signing(struct TCP_Server_Info *server,
bool mnt_sign_required);
int parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size,
unsigned int *num_of_nodes,
struct dfs_info3_param **target_nodes,
const struct nls_table *nls_codepage, int remap,
const char *searchName, bool is_unicode);
struct cifs_ses *sesInfoAlloc(void);
void sesInfoFree(struct cifs_ses *buf_to_free);
struct cifs_tcon *tcon_info_alloc(bool dir_leases_enabled,
enum smb3_tcon_ref_trace trace);
void tconInfoFree(struct cifs_tcon *tcon, enum smb3_tcon_ref_trace trace);
int setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp);
void cifs_crypto_secmech_release(struct TCP_Server_Info *server);
int calc_seckey(struct cifs_ses *ses);
int generate_smb30signingkey(struct cifs_ses *ses,
struct TCP_Server_Info *server);
int generate_smb311signingkey(struct cifs_ses *ses,
struct TCP_Server_Info *server);
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
void cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb);
bool couldbe_mf_symlink(const struct cifs_fattr *fattr);
int check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
const unsigned char *path);
int E_md4hash(const unsigned char *passwd, unsigned char *p16,
const struct nls_table *codepage);
struct TCP_Server_Info *cifs_find_tcp_session(struct smb3_fs_context *ctx);
struct cifs_tcon *cifs_setup_ipc(struct cifs_ses *ses, bool seal);
void __cifs_put_smb_ses(struct cifs_ses *ses);
struct cifs_ses *cifs_get_smb_ses(struct TCP_Server_Info *server,
struct smb3_fs_context *ctx);
int cifs_readv_receive(struct TCP_Server_Info *server,
struct mid_q_entry *mid);
int cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const unsigned char *path, char *pbuf,
unsigned int *pbytes_read);
int cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const unsigned char *path, char *pbuf,
unsigned int *pbytes_written);
int __cifs_calc_signature(struct smb_rqst *rqst,
struct TCP_Server_Info *server, char *signature,
struct cifs_calc_sig_ctx *ctx);
enum securityEnum cifs_select_sectype(struct TCP_Server_Info *server,
enum securityEnum requested);
int cifs_alloc_hash(const char *name, struct shash_desc **sdesc);
void cifs_free_hash(struct shash_desc **sdesc);
int cifs_try_adding_channels(struct cifs_ses *ses);
int smb3_update_ses_channels(struct cifs_ses *ses,
struct TCP_Server_Info *server,
bool from_reconnect, bool disable_mchan);
bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface);
int cifs_ses_get_chan_index(struct cifs_ses *ses,
struct TCP_Server_Info *server);
void cifs_chan_set_in_reconnect(struct cifs_ses *ses,
struct TCP_Server_Info *server);
void cifs_chan_clear_in_reconnect(struct cifs_ses *ses,
struct TCP_Server_Info *server);
void cifs_chan_set_need_reconnect(struct cifs_ses *ses,
struct TCP_Server_Info *server);
void cifs_chan_clear_need_reconnect(struct cifs_ses *ses,
struct TCP_Server_Info *server);
bool cifs_chan_needs_reconnect(struct cifs_ses *ses,
struct TCP_Server_Info *server);
bool cifs_chan_is_iface_active(struct cifs_ses *ses,
struct TCP_Server_Info *server);
void cifs_decrease_secondary_channels(struct cifs_ses *ses,
bool disable_mchan);
void cifs_chan_update_iface(struct cifs_ses *ses,
struct TCP_Server_Info *server);
int SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon,
bool in_mount);
void extract_unc_hostname(const char *unc, const char **h, size_t *len);
int copy_path_name(char *dst, const char *src);
int smb2_parse_query_directory(struct cifs_tcon *tcon, struct kvec *rsp_iov,
int resp_buftype,
struct cifs_search_info *srch_inf);
struct super_block *cifs_get_dfs_tcon_super(struct cifs_tcon *tcon);
void cifs_put_tcp_super(struct super_block *sb);
int cifs_update_super_prepath(struct cifs_sb_info *cifs_sb, char *prefix);
char *extract_hostname(const char *unc);
char *extract_sharename(const char *unc);
int parse_reparse_point(struct reparse_data_buffer *buf, u32 plen,
struct cifs_sb_info *cifs_sb, const char *full_path,
struct cifs_open_info_data *data);
int __cifs_sfu_make_node(unsigned int xid, struct inode *inode,
struct dentry *dentry, struct cifs_tcon *tcon,
const char *full_path, umode_t mode, dev_t dev,
const char *symname);
int cifs_sfu_make_node(unsigned int xid, struct inode *inode,
struct dentry *dentry, struct cifs_tcon *tcon,
const char *full_path, umode_t mode, dev_t dev);
umode_t wire_mode_to_posix(u32 wire, bool is_dir);
#ifdef CONFIG_CIFS_DFS_UPCALL
static inline int get_dfs_path(const unsigned int xid, struct cifs_ses *ses,
const char *old_path,
const struct nls_table *nls_codepage,
struct dfs_info3_param *referral, int remap)
{
return dfs_cache_find(xid, ses, nls_codepage, remap, old_path,
referral, NULL);
}
int match_target_ip(struct TCP_Server_Info *server, const char *host,
size_t hostlen, bool *result);
int cifs_inval_name_dfs_link_error(const unsigned int xid,
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const char *full_path, bool *islink);
#else
static inline int cifs_inval_name_dfs_link_error(const unsigned int xid,
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const char *full_path,
bool *islink)
{
*islink = false;
return 0;
}
#endif
static inline int cifs_create_options(struct cifs_sb_info *cifs_sb, int options)
{
if (cifs_sb && (backup_cred(cifs_sb)))
return options | CREATE_OPEN_BACKUP_INTENT;
else
return options;
}
int cifs_wait_for_server_reconnect(struct TCP_Server_Info *server, bool retry);
static inline void cifs_put_smb_ses(struct cifs_ses *ses)
{
__cifs_put_smb_ses(ses);
}
/* Get an active reference of @ses and its children.
*
* NOTE: make sure to call this function when incrementing reference count of
* @ses to ensure that any DFS root session attached to it (@ses->dfs_root_ses)
* will also get its reference count incremented.
*
* cifs_put_smb_ses() will put all references, so call it when you're done.
*/
static inline void cifs_smb_ses_inc_refcount(struct cifs_ses *ses)
{
lockdep_assert_held(&cifs_tcp_ses_lock);
ses->ses_count++;
}
static inline bool dfs_src_pathname_equal(const char *s1, const char *s2)
{
if (strlen(s1) != strlen(s2))
return false;
for (; *s1; s1++, s2++) {
if (*s1 == '/' || *s1 == '\\') {
if (*s2 != '/' && *s2 != '\\')
return false;
} else if (tolower(*s1) != tolower(*s2))
return false;
}
return true;
}
static inline void smb_get_mid(struct mid_q_entry *mid)
{
refcount_inc(&mid->refcount);
}
static inline void release_mid(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
if (refcount_dec_and_test(&mid->refcount))
__release_mid(server, mid);
}
static inline void cifs_free_open_info(struct cifs_open_info_data *data)
{
kfree(data->symlink_target);
free_rsp_buf(data->reparse.io.buftype, data->reparse.io.iov.iov_base);
memset(data, 0, sizeof(*data));
}
static inline int smb_EIO(enum smb_eio_trace trace)
{
trace_smb3_eio(trace, 0, 0);
return -EIO;
}
static inline int smb_EIO1(enum smb_eio_trace trace, unsigned long info)
{
trace_smb3_eio(trace, info, 0);
return -EIO;
}
static inline int smb_EIO2(enum smb_eio_trace trace, unsigned long info, unsigned long info2)
{
trace_smb3_eio(trace, info, info2);
return -EIO;
}
static inline int cifs_get_num_sgs(const struct smb_rqst *rqst,
int num_rqst,
const u8 *sig)
{
unsigned int len, skip;
unsigned int nents = 0;
unsigned long addr;
size_t data_size;
int i, j;
/*
* The first rqst has a transform header where the first 20 bytes are
* not part of the encrypted blob.
*/
skip = 20;
/* Assumes the first rqst has a transform header as the first iov.
* I.e.
* rqst[0].rq_iov[0] is transform header
* rqst[0].rq_iov[1+] data to be encrypted/decrypted
* rqst[1+].rq_iov[0+] data to be encrypted/decrypted
*/
for (i = 0; i < num_rqst; i++) {
data_size = iov_iter_count(&rqst[i].rq_iter);
/* We really don't want a mixture of pinned and unpinned pages
* in the sglist. It's hard to keep track of which is what.
* Instead, we convert to a BVEC-type iterator higher up.
*/
if (data_size &&
WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter)))
return smb_EIO(smb_eio_trace_user_iter);
/* We also don't want to have any extra refs or pins to clean
* up in the sglist.
*/
if (data_size &&
WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter)))
return smb_EIO(smb_eio_trace_extract_will_pin);
for (j = 0; j < rqst[i].rq_nvec; j++) {
struct kvec *iov = &rqst[i].rq_iov[j];
addr = (unsigned long)iov->iov_base + skip;
if (is_vmalloc_or_module_addr((void *)addr)) {
len = iov->iov_len - skip;
nents += DIV_ROUND_UP(offset_in_page(addr) + len,
PAGE_SIZE);
} else {
nents++;
}
skip = 0;
}
if (data_size)
nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX);
}
nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE);
return nents;
}
/* We can not use the normal sg_set_buf() as we will sometimes pass a
* stack object as buf.
*/
static inline void cifs_sg_set_buf(struct sg_table *sgtable,
const void *buf,
unsigned int buflen)
{
unsigned long addr = (unsigned long)buf;
unsigned int off = offset_in_page(addr);
addr &= PAGE_MASK;
if (is_vmalloc_or_module_addr((void *)addr)) {
do {
unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off);
sg_set_page(&sgtable->sgl[sgtable->nents++],
vmalloc_to_page((void *)addr), len, off);
off = 0;
addr += PAGE_SIZE;
buflen -= len;
} while (buflen);
} else {
sg_set_page(&sgtable->sgl[sgtable->nents++],
virt_to_page((void *)addr), buflen, off);
}
}
static inline int cifs_get_writable_file(struct cifsInodeInfo *cifs_inode,
unsigned int find_flags,
struct cifsFileInfo **ret_file)
{
find_flags &= ~FIND_OPEN_FLAGS;
return __cifs_get_writable_file(cifs_inode, find_flags, 0, ret_file);
}
static inline struct cifsFileInfo *
find_readable_file(struct cifsInodeInfo *cinode, unsigned int find_flags)
{
find_flags &= ~FIND_OPEN_FLAGS;
find_flags |= FIND_NO_PENDING_DELETE;
return __find_readable_file(cinode, find_flags, 0);
}
#endif /* _CIFSPROTO_H */
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